| <?php |
| /** |
| * File containing the ezcTemplateAssignmentOptimizer |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| * @package Template |
| * @version //autogen// |
| * @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0 |
| * @access private |
| */ |
| /** |
| * This class does some very basic assignment optimizations. |
| * |
| * <code> |
| * $myVar .= "hello"; |
| * $myVar .= " world"; |
| * </code> |
| * |
| * Becomes: |
| * <code> |
| * $myVar .= "hello world"; |
| * </code> |
| * |
| * @package Template |
| * @version //autogen// |
| * @access private |
| */ |
| class ezcTemplateAstToAstAssignmentOptimizer extends ezcTemplateAstWalker |
| { |
| /** |
| * Returns true if the given element consists of <var> = <static value>, otherwise false. |
| * |
| * @param ezcTemplateAstNode $element |
| * @return bool |
| */ |
| protected function isOptimizableConcat( $element ) |
| { |
| if ( $element instanceof ezcTemplateGenericStatementAstNode ) |
| { |
| if ( $element->expression instanceof ezcTemplateConcatAssignmentOperatorAstNode ) |
| { |
| if ( $element->expression->parameters[0] instanceof ezcTemplateVariableAstNode ) |
| { |
| if ( $element->expression->parameters[1] instanceof ezcTemplateLiteralAstNode ) |
| { |
| return true; |
| } |
| } |
| } |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Returns an optimized AST body from the original AST body $body. |
| * |
| * @param ezcTemplateBodyAstNode $body |
| * @return bool |
| */ |
| public function visitBodyAstNode( ezcTemplateBodyAstNode $body ) |
| { |
| array_unshift( $this->nodePath, $body ); |
| |
| $statements = sizeof( $body->statements ); |
| |
| $k = 0; |
| $i = 0; |
| $j = 1; |
| while ( $i < $statements ) |
| { |
| if ( $this->isOptimizableConcat( $body->statements[$i] ) ) |
| { |
| while ( $i + $j < $statements && $this->isOptimizableConcat( $body->statements[$i + $j] ) && |
| ( $body->statements[$i]->expression->parameters[0]->name === $body->statements[$i + $j]->expression->parameters[0]->name ) ) |
| { |
| $body->statements[$i]->expression->parameters[1]->value .= $body->statements[$i + $j]->expression->parameters[1]->value; |
| $j++; |
| } |
| } |
| |
| if ( $k != $i ) |
| { |
| $body->statements[$k] = $body->statements[$i]; |
| } |
| |
| $i += $j; |
| $j = 1; |
| $k++; |
| } |
| |
| for( $i = $k; $i < $statements; $i++ ) |
| { |
| unset( $body->statements[$i] ); |
| } |
| |
| array_shift( $this->nodePath ); |
| |
| return $body; |
| } |
| } |
| ?> |